Journal
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
Volume 148, Issue -, Pages 457-465Publisher
ELSEVIER
DOI: 10.1016/j.ijbiomac.2020.01.176
Keywords
Aspergillus sydowii; Cd(II); Immobilization; Magnetic chitosan bead; Trichlorfon
Funding
- National Key Research and Development Program of China [2018YFC1801702]
- Hubei Provincial Technical Innovation Project of China [2016ACA162]
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Simultaneous removal of heavy metals and organics from wastewater has always been an environmental problem with great concern. In this study, a novel ecofriendly bioborbent, magnetic chitosan beads immobilized Aspergillus sydowii (MCBAs) were synthesized and used to simultaneously remove trichlorfon (TCF) and Cd(II) from aqueous solution. MCBAs showed an increased special surface area (5538 m(2).g(-1)) through immobilizing A. sydowii and its saturation magnetization reached 14.62 emu.g(-1). The equilibrium removal capacities of TCF and Cd(II) were 135.43 mg.g(-1) and 56.40 mg.g(-1) in the co-system with 200 mg.L-1 TCF and 50 mg.L-1 Cd (II), respectively. The removal capacities of TCF and Cd(II) were strongly depended on the immobilized A. sydowii spore concentration, initial concentrations of TCF and Cd(II), and MCBAs dose. TCF biodegradation intermediates were identified by gas chromatography-mass spectrometry system. Fourier transform infrared spectra displayed that -OH and -NH groups on MCBAs mainly participated in the Cd(II) sequestration and the C=O stretching vibration was possibly related to the degradation intermediates of TCF. MCBAs exhibited excellent recyclability upto four cycles. Therefore, MCBAs are suitable and effective for the simultaneous removal of TCF and Cd(II) from wastewater. (C) 2020 Elsevier B.V. All rights reserved.
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